additional sourceBeu, A. (2010). Marine Mollusca of isotope stages of the last 2 million years in New Zealand. Part 3. Gastropoda (Vetigastropoda - Littorinimorpha). <em>Journal of the Royal Society of New Zealand.</em> 40(3-4): 59-180., available online athttps://doi.org/10.1080/03036758.2010.500717[details]